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The cross-shaped sign, represented in its simplest form by a crossing of two lines at right angles, greatly antedates, in both East and West, the introduction of Christianity. It goes back to a very remote period of human civilization. It is supposed to have been used not just for its ornamental value, but also with religious significance.[1]

Some have sought to attach to the widespread use of this sign, in particular in its swastika form, a real ethnographic importance. It may have represented the apparatus used in kindling fire, and thus as the symbol of sacred fire [2] or as a symbol of the sun,[3] denoting its daily rotation. It has also been interpreted as the mystic representation of lightning or of the god of the tempest, and even the emblem of the Aryan pantheon and the primitive Aryan civilization.

Another symbol that has been connected with the cross is the ansated cross (ankh or crux ansata) of the ancient Egyptians, which often appears as a symbolic sign in the hands of the goddess Sekhet, and appears as a hieroglyphic sign of life or of the living.[4] In later times the Egyptian Christians (Copts), attracted by its form, and perhaps by its symbolism, adopted it as the emblem of the cross (Gayet, "Les monuments coptes du Musée de Boulaq" in "Mémoires de le mission française du Caire", VIII, fasc. III, 1889, p. 18, pl. XXXI–XXXII & LXX–LXXI).

In the Bronze Age we meet in different parts of Europe a more accurate representation of the cross, as conceived in Christian art, and in this shape it was soon widely diffused. This more precise characterization coincides with a corresponding general change in customs and beliefs. The cross is now met with, in various forms, on many objects: fibulas, cinctures, earthenware fragments, and on the bottom of drinking vessels. De Mortillet is of opinion that such use of the sign was not merely ornamental, but rather a symbol of consecration, especially in the case of objects pertaining to burial. In the proto-Etruscan cemetery of Golasecca every tomb has a vase with a cross engraved on it. True crosses of more or less artistic design have been found in Tiryns, at Mycenæ, in Crete, and on a fibula from Vulci.

The material in this section is a slightly abbreviated copy of text in the public-domain Catholic Encyclopedia reproduced in full in Wikisource.

During the first two centuries of Christianity, the cross may have been rare in Christian iconography, as it depicts a purposely painful and gruesome method of public execution. The Ichthys, or fish symbol, was used by early Christians. The Chi-Rho monogram, which was adopted by Constantine I in the fourth century as his banner (see labarum), was another Early Christian symbol of wide use.

However, the cross symbol was already associated with Christians in the second century, as is indicated in the anti-Christian arguments cited in the Octavius of Minucius Felix, chapters IX and XXIX, written at the end of that century or the beginning of the next,[5] and by the fact that by the early third century the cross had become so closely associated with Christ that Clement of Alexandria, who died between 211 and 216, could without fear of ambiguity use the phrase τὸ κυριακὸν σημεῖον (the Lord's sign) to mean the cross, when he repeated the idea, current as early as the apocryphalEpistle of Barnabas, that the number 318 (in Greek numerals, ΤΙΗ) in Genesis 14:14 was interpreted using numerology as a foreshadowing (a "type") of the cross (T, an upright with crossbar, standing for 300) and of Jesus (ΙΗ, the first two letter of his name ΙΗΣΟΥΣ, standing for 18),[6] and his contemporary Tertullian could designate the body of Christian believers as crucis religiosi, i.e. "devotees of the Cross".[7] In his book De Corona, written in 204, Tertullian tells how it was already a tradition for Christians to trace repeatedly on their foreheads the sign of the cross.[8]

The cross as a Christian symbol or "seal" came into use at least as early as the second century (see "Apost. Const." iii. 17; Epistle of Barnabas, xi.-xii.; Justin, "Apologia," i. 55-60; "Dial. cum Tryph." 85-97); and the marking of a cross upon the forehead and the chest was regarded as a talisman against the powers of demons (Tertullian, "De Corona," iii.; Cyprian, "Testimonies," xi. 21–22; Lactantius, "Divinæ Institutiones," iv. 27, and elsewhere). Accordingly the Christian Fathers had to defend themselves, as early as the second century, against the charge of being worshipers of the cross, as may be learned from Tertullian, "Apologia," xii., xvii., and Minucius Felix, "Octavius," xxix. Christians used to swear by the power of the cross (see Apocalypse of Mary, viii., in James, "Texts and Studies," iii. 118).

In Christianity the cross reminds Christians of God's act of love in Christ's sacrifice at Calvary—"the Lamb of God who takes away the sin of the world." The cross also reminds Christians of Jesus' victory over sin and death, since it is believed that through His death and resurrection He conquered death itself. They venerate it not as a material object seen in isolation but as the symbol of the sacrifice by which Christ saved them, as the instrument of Christ's triumph, according to Colossians 2:15 ("Having disarmed the powers and authorities, he made a public spectacle of them, triumphing over them by the cross"),[9] and "as the instrument of our God's saving Love".[10]

Roman Catholic, Eastern Orthodox and Anglican bishops place a cross [+] before their name when signing a document. A cross [†] may also be placed before the name of a departed Christian when their name appears in print.

The cross is often shown in different shapes and sizes, in many different styles. It may be used in personal jewelry, or used on top of church buildings. It is shown both empty and in crucifix form, that is, with a figure of Christ, often referred to as the corpus (Latin for "body"), affixed to it. Roman Catholic, Anglican and Lutheran depictions of the cross are often crucifixes, in order to emphasize that it is Jesus that is important, rather than the cross in isolation. Many Protestant traditions depict the cross without the corpus, interpreting this form as an indication of belief in the resurrection rather than as representing the interval between the death and the resurrection of Jesus.

Crosses are a prominent feature of Christian cemeteries, either carved on gravestones or as sculpted stelas. Because of this, planting small crosses is sometimes used in countries of Christian culture to mark the site of fatal accidents, or to protest alleged deaths.

In Catholic countries, crosses are often erected on the peaks of prominent mountains, such as the Zugspitze or Mount Royal, so as to be visible over the entire surrounding area.

Forms of the Christian cross include:

Altar cross. A cross on a flat base to rest upon the altar of a church. The earliest known representation of an altar cross appears in a miniature in a 9th-century manuscript. By the 10th century such crosses were in common use, but the earliest extant altar cross is a 12th-century one in the Great Lavra on Mt. Athos. Mass in the Roman Rite requires the presence of a cross (more exactly, a crucifix) "on or close to" the altar.[12] Accordingly, the required cross may rest on the reredos rather than on the altar, or it may be on the wall behind the altar or be suspended above the altar.

Ankh. Shaped like the letter T surmounted by an oval or circle. Originally the Egyptian symbol for "life", it was adopted by the Copts (Egyptian Christians). Also called a crux ansata, meaning "cross with a handle".

Calvary cross. Either a stepped cross (see below), or a Gothic-style cross mounted on a base shaped to resemble Calvary (the place where Christ was crucified, pictured as a hill), with the Virgin Mary and Saint John on either the base or crossarms.

Canterbury cross. A cross with four arms of equal length which widen to a hammer shape at the outside ends. Each arm has a triangular panel inscribed in a triquetra (three-cornered knot) pattern. There is a small square panel in the center of the cross. A symbol of the Anglican and Episcopal Churches.

Celtic Cross. Essentially a Latin cross, with a circle enclosing the intersection of the upright and crossbar, as in the standing High crosses;

Consecration cross. One of 12 crosses painted on the walls of a church to mark where it had been anointed during its consecration.

The native Canadian inukshuk symbol, as depicted on the Flag of Nunavut, a Canadian territory, resembles a Christian cross.

Jerusalem Cross Also known as the Crusader's Cross. A big cross with four smaller crosses on its corner. It was used as a symbol of the Crusaders who fought against the Islamic forces.

Latin cross. With a longer descending arm. Along with the Greek cross, it is the most common form, it represents the cross of Jesus' crucifixion.

Living cross. One of two possibilities: Either a natural cross made of living vines and branches. Or, a man-made cross with vines or plants planted at its base. In the all-natural version, it refers to the legend that Jesus' cross was made from the Tree of Life. In the man-made cross with plants planted at the base, it contrasts the "new" Tree of Life (the cross) with the Book of Genesis Tree of Life. In both cases it shows Jesus' death (the cross) as a redemption for original sin (Tree of Life).

Papal Cross. A cross with three bars near the top. The bar are of unequal length, each one shorter than the one below.

Patriarchal cross, also called an archiepiscopal cross or a crux gemina. A double cross, with the two crossbars near the top. The upper one is shorter, representing the plaque nailed to Jesus' cross. Similar to the Cross of Lorraine, though in the original version of the latter, the bottom arm is lower. The Eastern Orthodox cross adds a slanted bar near the foot.

Peter cross. A cross with the crossbeam placed near the foot, that is associated with Saint Peter because of the tradition that he was crucified with head down. In modern times it has been used also as a symbol of the Devil and Satanism.

Saltire or crux decussata. An X-shaped cross associated with St. Andrew, patron of Scotland, and so a national symbol of that country. The shape is that of the cross on which Saint Andrew is said to have been martyred. Also known as St. Andrew's Cross or Andrew Cross.

Stepped cross. A cross resting on a base with three steps, also called a graded or a Calvary cross.

Suppedaneum cross. Also known as Crux Orthodoxa, Byzantine cross, Eastern cross, Russian cross, Slavic or Slavonic cross. A three-barred cross in which the short top bar represents the inscription over Jesus' head, and the lowest (usually slanting) short bar, placed near the foot, represents his footrest (in Latin, suppedaneum). This cross existed very early in Byzantium, and was adopted by the Russian Orthodox Church and especially popularized in the Slavic countries.

↑"Various objects, dating from periods long anterior to the Christian era, have been found, marked with crosses of different designs, in almost every part of the old world. India, Syria, Persia and Egypt have all yielded numberless examples . . . The use of the cross as a religious symbol in pre-Christian times and among non-Christian peoples may probably be regarded as almost universal, and in very many cases it was connected with some form of nature worship" (Encyclopaedia Britannica (1946), Vol. 6, p. 753.

↑"The cross in the form of the 'Crux Ansata' . . . was carried in the hands of the Egyptian priests and Pontiff kings as the symbol of their authority as priests of the Sun god and was called 'the Sign of Life'." (The Worship of the Dead (London, 1904), by Colonel J. Garnier, p. 226.

↑Minucius Felix speaks of the cross of Jesus in its familiar form, likening it to objects with a crossbeam or to a man with arms outstretched in prayer (Octavius of Minucius Felix, chapter XXIX).

↑Apology., chapter xvi. In this chapter and elsewhere in the same book, Tertullian clearly distinguishes between a cross and a stake.

↑"At every forward step and movement, at every going in and out, when we put on our clothes and shoes, when we bathe, when we sit at table, when we light the lamps, on couch, on seat, in all the ordinary actions of daily life, we trace upon the forehead the sign" (De Corona, chapter 3)